Well I'll give Arlovski credit, he was winning the first 2 minutes with his boxing. Fedor looked almost confused, didn't see any openings and was leaving himself open for an uppercut with really wide slips. All he needed was an opening though, and Arlovski gave it to him.
edit: also HOLY SHIT. Belfort really knocked Lindland THE FUCk out. that was definitely the most brutal knock out i've ever seen